js：

var articleContent = new Vue({
        el: "#articleContent",
        data: {
            articles: []
        },
    });

Vue.filter('yearMonthTime', function (value) {//value為13位的時間戳
        function add0(m) {
            return m < 10 ? '0' + m : m
        }

        var time = new Date(parseInt(value));
        var y = time.getFullYear();
        var m = time.getMonth() + 1;
        var d = time.getDate();

        return y + '.' + add0(m);
    });
 

html:

<span v-cloak>{{article.publishTime | yearMonthTime}}</span>

結果：